Using the Task class in powershell

I am trying to use the Task class in Powershell to start an operation asynchronously. But Im gets the following exception:

Id                     : 1
Exception              : System.AggregateException: One or more errors occurred. ---> System.Management.Automation.PSInvalidOperationException: There is no Runspace available to
                         run scripts in this thread. You can provide one in the DefaultRunspace property of the System.Management.Automation.Runspaces.Runspace type. The script
                         block you attempted to invoke was:  Write-Host "hey!"
                            at System.Management.Automation.ScriptBlock.InvokeAsDelegateHelper(Object dollarUnder, Object dollarThis, Object[] args)
                            at System.Threading.Tasks.Task.Execute()
                            --- End of inner exception stack trace ---
                         ---> (Inner Exception #0) System.Management.Automation.PSInvalidOperationException: There is no Runspace available to run scripts in this thread. You can
                         provide one in the DefaultRunspace property of the System.Management.Automation.Runspaces.Runspace type. The script block you attempted to invoke was:
                         Write-Host "hey!"
                            at System.Management.Automation.ScriptBlock.InvokeAsDelegateHelper(Object dollarUnder, Object dollarThis, Object[] args)
                            at System.Threading.Tasks.Task.Execute()<---

Status                 : Faulted
IsCanceled             : False
IsCompleted            : True
CreationOptions        : DenyChildAttach
AsyncState             :
IsFaulted              : True
AsyncWaitHandle        : System.Threading.ManualResetEvent
CompletedSynchronously : False

My code is:

$delegate = [System.Action]{ Write-Host "Test" }
[System.Threading.Tasks.Task]::Run($delegate)